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ACL main bearings for the BMW B58B30 and S58B30 3.0L inline-six are an undersize set at .025mm (0.001") intended for engines requiring machining to spec. These bearings restore correct journal clearances after crank grinding and are supplied to OEM-style tolerances for reliable crank support in BMW B58 and S58 3.0L inline-six rebuilds.
ACL BMW B58B30/S58B30 3.0L Inline 6 .025mm Oversized Main Bearings
